consistency of print statements

examples/python_unet/unet_inference.ipynb

@@ -155,7 +155,7 @@
    "source": [
     "mask = model.run({'inputs':input_im}) # Your first inference would take longer than the following ones.\n",
     "output_mask = np.array(mask[0])\n",
-    "output_mask.shape"
+    "print(output_mask.shape)"
    ]
   },
   {